Scissors or shears.



D. MGKENNA.

SGISSORS 0R SHEARS.

(Application led Nov. 7, 1901.)

Patented lune lo, wb2.-

(Ilo M udel.)

` INVENTOR,

me Norms PETERS cu. Pnofuuwo.. wnsnmnw n r NITED STATES i PATENT OFFICE.

DAVID MCKENNA, OF WATERBURY, CONNECTICUT, ASSIGNOR OF ONE-HALF TO JAMESMCGEE, OF WATERBURY, CONNECTICUT.

SCISSORS OR SHEARS.

SPECIFICATION forming part of Letters Patent No. 702,238, dated J une10, 1902.

Application tiled November 7, 1901. Serial No. 81,459. (No model.)

T0 all whom it ntcty concern:

Be it known thatI, DAVID MCKENNA, a citizen of the United States,residing at Waterbury, county of New Haven, State of Connecticut, haveinvented a new and useful Scissors or Shears,of Which the following is aspeciication.

My invention relates to the manufacture oi scissors and shears; and hasfor its object to provide simple and inexpensive means for preventingthe pivot from turning. It is of course Well understood that the pivotin ordinary scissors and shears, more especially the lower grade of bothscissors and shears, is a screw-stud upon which one blade, ordinarilythe lower blade when the shears are held in the horizontal plane, ispivoted, the threaded 'end of the stud engaging the other blade, in

the present instance the upper blade, and being held against turningloose by riveting or heading down the threaded end upon the outer faceof the upper blade. This method of securing the stud against turningloose is objectionable for three reasons: In the first place, the headedend of the stud always looks rough and unfinished and renders itimpossible to give a neat and finished appearance to that side of theshears; in the second place, the headed end of the stud is frequently sojagged and sharp that it will tear the skin and cause seriousinconvenience by catching on fine goods-as, for example, `upon silk,fiosses, fine yarns, &c.and, in the third place, the heading frequentlydoes not hold, so that there is constant trouble caused by the pivotsbecoming loose and turning sufliciently to loosen the blades. My presentinvention provides a simple and inexpensive means of overcoming theseobjections and insures that Without appreciable difference in the costof production the pivots shall be securely but detachably retained inplace-that is, securely retained under the conditions of use, but insuch a manner as to permit their convenient removal should it be desiredto separate the blades for sharpening or for any purposewhatever, thefastening furthermore being of such a nature as not to be to theslightest degree oensive to the eye, but ratherto add to the generalattractiveness of the shears and being Wholly out of the way, so thatdanger of tearing the skin or the catching of silks, iiosses, or yarnsthereon shall be Wholly avoided.

In order to accomplish the desired result, I have devised the novelpivot-fastening device, of which the followingdescription, in connectionwith the accompanying drawings, is a specification, reference charactersbeing used to designate the several parts:

Figure 1 is an elevation of a pair of shears, illustrating theapplication thereto of my novel pivot-fastening device; Fig. 2, alongitudinal section, on an enlarged scale, on the line 2 2 in Fig. l;and Fig. 3 is a transverse section, on an enlarged scale, on the line 33 in Fig. 1.

A denotes one of the blades of a pair of scissors or shears, Which forconvenience I will term in .this instance the under blade, B the otherblade, which for convenience I will term in this instance the upperblade, and C the pivot. The pivot,which is a screw-stud, is providedwith a head 10, which is recessed into the under blade and is providedWith the usual slot 11, by which it is turned to place by ascrew-driver.

12 denotes the threaded end of the pivot, which is shown as engaging theupper blade. The novel feature of my invention consists in providingthisvthreaded end of the stud with an open recess or groove 13, which isengaged by a removable retaining device 14 to prevent the pivot fromturning. The exact construction of this removable retaining device isnot of the essence of my invention, it being simply required that adevice be provided which shall normally rest in the groove or recess inthe threaded end of the pivot to retain the pivot against turning andshall be conveniently removable, so as to permit the removal of thepivot should it be required for any purpose to separate the blades. Inthe present instance I have shown a retaining device consisting of aspring lying in a slot 15 in the face of the upper blade, the free endof said spring resting-` in and engaging the groove 13 and beingprovided Witha loop or eye 16 for convenience in lifting the retainingdevice out of groove 13 should it be required to turn out the pivot orgive it a partial rotation to adjust it. The retaining device may besoldered or retained in place in IOO any suitable manner. In lthepresent instance I have shown the retaining device as secured to theblade by means of la rivet 17, lying Wholly below the surface of theblade, the retaining device being shown as pro vided with a ring 18,through which the rivet passes, the head of the rivet and the ring lyingin an enlargement 19 of slot 15, the end of the pivot, the rivet, andthe Whole of the retaining device, With the exception of eye 16, lyingbeloW or iiush with the surface of the blade, and a small roundedportion only of the eye lying above the surface of the blade forconvenience in manipulation, as already described.

Having thus described my invention, I claiml. The combination with theblades of scissors and shears, of a pivot upon which one of the bladesturns and which is provided with a threaded end to engage the otherblade and an open groove or recess in its end, and a removable springretaining device which engages the groove to prevent the pivot fromturning, and which may be lifted from said groove to enable the pivot tobe adjusted.

2. The combination with the blades of scissors and shears, o f a pivotupon which one of the blades turns and which is provided with a threadedend to engage the other blade and an open groove or recess in its end,and a removable spring retaining device recessed into the blade andengaging the groove to prevent the pivot from turning, and which may belifted from said groove to enable the pivot to be adjusted.

3. The combination with the blades Aand B of scissors and shears, saidblade B having a slot 15, of a pivot upon which blade A turns and whichis threaded to engage blade B, the threaded end of the pivot having anopen groove or recess 13 in its end, and a spring retaining devicerigidly secured in slot 15, the free end of said retaining deviceengaging the groove 13 to prevent the pivot from turning.

In testimony whereof I affix my signature in presence of two witnesses.

l DAVID MCKENNA.

Witnesses:

FRANCIS X. RICHMOND, CHAS. W. BAUBY.

